Abstract: Permanently magnetized members (24, 26) of a surveillance system label (16) are disposed adjacent a ferromagnetic nonlinear element (30) for biasing the hysteresis loop of the nonlinear element (30) near the knee (40) of the magnetization curve. The nonlinear element (30) includes low permeability sections (32,34) and high permeability section (36). The high permeability section (36) of the nonlinear element (30) is disposed adjacent a radiating dipole (28) for radiating the summation frequency of a pair of frequencies impinging on the nonlinear element (30). A memory magnet (38) with a changeable magnetism is disposed adjacent the high reluctance section (36) of the nonlinear element (30). The magnetism of the memory magnet (38) can be changed to provide either an active or inactive status of the label (16).

Abstract: An apparatus for dispensing an additive (70) into a stream (14) of well proppant includes a sealed housing (42), (44), (52) containing a first chamber (102), a second chamber (104), and an additive dispenser (64), (72) operably connected to a motor (92). The upper chamber (102) is adapted to contain the additive (70), and the lower chamber (104) communicated with the pressurized well proppant stream (14). The additive dispensing means (64), (72) is disposed between the upper chamber (102) and the lower chamber (104). A pressure equalizing tube (98) within said housing (42), (44), (52) extends from the upper chamber (102) through the additive dispenser (64), (72) to the lower chamber (104) to equalize the fluid pressure existing in the lower chamber (104) with the fluid pressure existing in the upper chamber (102) during the dispensing of the additive (70) from the upper chamber (102) to the lower chamber (104).

Abstract: Apparatus for coupling multi-conduit drill pipes to maintain arcuate registry between connected pipes, and for transferring the drive torque of one drill pipe to the next drill pipe. One end of one drill pipe (50) includes drive lugs (100) matable with corresponding drive recesses (102) in the end of the next drill pipe (52). An index lug (104) in the drill pipe end, different that the drive lugs (100), is matable with a corresponding index recess (106) in another pipe end ot maintain arcuate registry of the coupled pipes and thus longitudinal alignment of the respective conduits (30) throughout the drill string. An internally threaded coupling collar (84) with different thread pitches at each end thereof is threadable onto the joined lug and recess mated drill pipe ends to hold the pipes mated. The joined pipe ends respectively include external threads (88, 90) of pitches corresponding to that of the coupling collar (84) so that a differential thread action draws the pipes together.

Abstract: A container (12) is disclosed for storing and dispensing surgical face masks (14). A divider (24) with an opening (47) is insertable into the container (12) for dividing it into two compartments (26, 28). The face panels of the masks (14) are stacked in one compartment (26), and the tie strings (30) are routed through the divider opening (47) into the other compartment (28). The divider (24) includes a pair of interlocking flaps (56, 58) which are engageable with folding flaps (34, 36) of the container, thereby locking the divider (24) in a desired position within the container (12).

Abstract: A circuit for automatically removing battery power from a night vision goggle (10) upon its detachment from a headgear (12). A magnet (34) on the headgear (12) is magnetically coupled to a magnetic reed switch (36) fixed to the goggle (10). On detachment of the goggle (10) from the headgear (12), the reed switch (36) switches battery current to a capacitively coupled coil (52) of a bistable latching relay (K1). Relay (K1) contacts (56, 62) are disconnected thus removing power from the image intensifier tube (40). On reattachment of the goggle (10) to the headgear (12), the On-Off switch (18) is cycled to pulse latching Relay K1 coil (64), thereby establishing a current path to the tube (40).

Abstract: An adjustment mechanism for adjusting headgear-mounted vision equipment with respect to the viewer's eyes. A goggle (14) is mounted to a carriage (20) which is slideable on a frame (10) mounted to the headgear (12). The carriage (20) is slideable on a rail (16) by a tongue and groove arrangement (48), and slideable on a rod (42). The carriage (20) includes a cavity (62) with a coil spring (64) therein encircling the rod (42). In its relaxed state, the coil spring (64) firmly engages the rod (42) and prevents movement of the carriage (20) on the rod (42). The coil spring ends (66, 68) are compressible together to release the engagement of the coil spring (64) about the rod (42). A finger-operated plunger assembly (28) includes a slotted end (118) for engaging one spring end (68). When the plunger button (116) is depressed, the spring ends (66, 68) are pressed together, thereby permitting adjustment of the carriage (20) on the rod (42).

Abstract: A facial exerciser is disclosed, for exercising the musculature of the face, chin and neck. A pair of spreader bar shanks (18, 22) each have fixed at the ends thereof a lip engaging piece (12, 14) and a coupler (20, 24). Each coupler (20, 24) includes an open groove (42, 44) into which the other shank is snapped, thereby connecting the shanks (18, 22) together in parallel, and allowing the shanks to slideably move with respect to each other. Each coupler (20, 24) includes a creased outer edge (46, 48) for holding an elastic band (26) so that the lip engaging pieces (12, 14) are elastically biased apart, thereby offering resistance to the constriction of a person's lips.

Abstract: Disclosed is a hub replacement device for use in vehicle tire retreading processes. An envelope (30) is sealed against the tire carcass sidewalls (22, 24) to provide an environmental seal of the new tread (54) on the carcass crown (50) during the vulcanization process. Three arcuate rigid plates (16, 18, 20), each with a pair of ribs (56, 58), are installed between the carcass beads (12, 14), for supporting the beads (12, 14), a predetermined distance apart along a majority of the bead circumference. Integral with each support plate (16, 18, 20) are pairs of opposing toggle clamps (32, 40) with hooked ends (36). A pair of annular discs (26, 28) are located on each side of the tire for applying a compressive force on the envelope (30) against the carcass sidewalls (22, 24). The annular discs (26, 28) are each equipped with pairs of anchor loops (42, 44) to which the hooked ends (36) of the toggle clamps (32,40) are releasably engaged.

Abstract: A portable enclosure for housing test equipment to test circuitry in a card cage rack employs a combined latch and support system which includes a bracket member retained in the enclosure and movable through an aperture in the enclosure to an extended position for attaching the enclosure to the card cage rack. The bracket member is movable back through the aperture to a retracted position within the enclosure to latch the enclosure closed.

Abstract: A voice operated switch having minimum signal amplification in the stages which separate the voice signals from the noise signals. The majority of amplification is then applied only to the syllabic rate voice component detected by an offset threshold in the syllabic rectifier-amplifier circuit to produce a two-state signal, one state representative of the presence of voice energy and the other state representative of the absence of voice energy. The two states are compared with a threshold voltage adjustable between a maximum and minimum voltage. A maximum and minimum setting allow a respective nontransmission and transmission of the voice signals irrespective of the presence or absence of such signals.

Abstract: A circuit for detecting data such as FSK data which is not amplitude modulated. The circuit employs detectors for detecting the frequency domain characteristics, time domain characteristics and amplitude characteristics of the data signals so that a precise indication of the presence or absence of such data signals can be made. Further provided is a threshold control circuit which can override the indication of the presence or absence of data signals irrespective of whether such signals are in fact present or absent.

Abstract: An angle adaptor for use in effecting coplanar routing schemes with flat ribbon cables. A unitary planar guide member around which the flat ribbon cable is folded in a desired routing angle employs hingeable arms to secure the ribbon cable to the guide member near the edges where the ribbon cable approaches and exits the member. The edge around which the ribbon cable is folded is cross-sectionally configured to eliminate sharp creases in the cable and thereby minimize cable conductor stress.

Abstract: A sheet stream sensing and control device for use in sheet feed systems having a motor driven conveyor transport means for advancing a reclining underlapped sheet stream toward a sheet removal means whereby the sheets are individualized and delivered to an operation such as a folding machine. The sensing and control device rests, vertically unconstrained, in a quiescent operating position upon the sheet stream and is responsive to the gradient of the surface discontinuity formed where the upper exposed surface of the foremost sheet joins the subsequent underlapped sheets. Conveyor control is effected when sheet stream advancement causes the surface gradient in the area of the discontinuity to exert pressure on the device electrical switch means to thereby deactivate the motor and interrupt sheet stream advancement. The sheet removal means continues to deplete the halted sheet stream thereby removing the switch pressure to energize the conveyor motor and advance the sheet stream.

Abstract: A faceplate assembly is provided for use in printed circuit board assemblies comprising a printed circuit board with electrical contact surfaces, and a housing frame with slotted guide rails to receive the circuit board, and edge connector means fastened to the housing frame and displaced at the end of the guide rails. The faceplate assembly includes insertion, extraction and positive latching means molded as an integral part of the faceplate. The faceplate body extends substantially the entire length of the printed circuit board edge and is pivotally mounted to the printed circuit board near one corner thereof. The insertion/extraction means, located on the pivotal end of the faceplate body, is actuated by manual pivotal movement of the faceplate thereby causing the insertion/extraction means to coact with a housing frame U-channel to thus effect engagement or disengagement of the printed circuit board electrical contacts to or from the housing frame edge connector contacts.